... alright.. I currently run php5... but I wish to change to php4..
I shutdown xampp, run the switch, and change to php4
I proceed to start xampp again.
Once started, I am no longer to access my Mysql.
The mysql password and username changes from
Root
******
in php5
to

Admin
(no password)
in php4

I cannot seem to change or add root and a password with ****** to it,
how can I do this from command prompt?

I just found "(3) MySQL starts with standard values for the user id and the password. The preset
user id is "root", the password is "" (= no password). To access MySQL via PHP
with the preset values, you'll have to use the following syntax:
mysql_connect("localhost","root","");
If you want to set a password for MySQL access, please use of mysqladmin.
To set the passwort "secret" for the user "root", type the following:
C:\xampp\mysql\bin\mysqladmin -u root password secret

After changing the password you'll have to reconfigure PHPMyAdmin to use the
new password, otherwise it won't be able to access the databases. To do that,
open the file config.inc.php in \xampp\phpmyadmin\ and edit the
following lines: